Best Time to Fly LAS to IAH: On-Time Stats by Hour & Airline
Harry Reid International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.0% of Las Vegas (LAS) to Houston (IAH) flights arrived on time (3,432 scheduled flights). That is 6.4 points above the national average of 77.6%.
Among 3 airlines, United Airlines led with 85.8% on time and Spirit Airlines was last with 78.3%.
Over 24 months, Wednesday was the most reliable day (88% on time) and June the worst month (76%).
The cancellation rate was 0.9% (US average 1.8%).
LAS to IAH on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 85.8% | 74 min | 0.4% | 2,594 |
| Frontier Airlines | 78.8% | 64 min | 2.2% | 368 |
| Spirit Airlines | 78.3% | 101 min | 2.8% | 470 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAS to IAH
On-time arrival % by scheduled departure hour (local time), 7,320 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 89.9% | 0.8% | 902 |
| 1am–2am | 71.4% | 8.7% | 69 |
| 5am–6am | Limited data | 20 | |
| 6am–7am | 92.1% | 0.9% | 895 |
| 7am–8am | 86.6% | 1.7% | 115 |
| 8am–9am | 90.0% | 1.2% | 762 |
| 9am–10am | 86.2% | 0.0% | 109 |
| 10am–11am | 86.5% | 0.6% | 880 |
| 11am–12pm | 77.0% | 0.5% | 205 |
| 12pm–1pm | 80.7% | 0.5% | 746 |
| 1pm–2pm | 78.9% | 0.5% | 372 |
| 2pm–3pm | 74.8% | 1.0% | 399 |
| 3pm–4pm | 77.9% | 0.6% | 699 |
| 4pm–5pm | 79.3% | 0.4% | 247 |
| 5pm–6pm | 82.8% | 0.5% | 187 |
| 6pm–7pm | 77.0% | 1.1% | 382 |
| 7pm–8pm | 74.2% | 0.7% | 148 |
| 8pm–9pm | 63.3% | 0.0% | 30 |
| 11pm–12am | 83.3% | 2.0% | 153 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAS to IAH
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 86.5% | +1.8 pts | 0.0% | 156 |
| Christmas & New Year (Dec 20 - Jan 3) | 88.5% | +3.8 pts | 0.3% | 297 |
| Summer peak (Jun 15 - Aug 15) | 78.0% | -6.7 pts | 1.7% | 1,142 |
| All other days | 84.7% | — | 0.7% | 5,725 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).